programming interface to eMMC

manojp — Thu, 29 Sep 2022 12:21:07 GMT

Hello NXP Expert,

I am very new to the QNX and NXP S32G. I am trying to access eMMC Card through C Code. Earlier, we managed to access eMMC Card on Linux using the following sample code. But in QNX, it faced an issue using ioctl() calls.

Do you have any information and/or documents discussing accessing eMMC in QNX through programming?

I want to know how to read (ex. a device's physical sector size), write, and erase (number of blocks) in eMMC.
This API's like open() close(), lssek(), write() works.

Sample Code used for LINUX

int fd = open("/dev/mmcblk0", O_RDWR);

struct stat sb;
fstat(fd, &sb)

int secsize = 0;
ret = ioctl(fd, BLKSSZGET, &secsize); //a device's physical sector size
if (ret < 0)
{
// set the erase block size
uint64_t range[2];
range[0] = offset; // input address
range[1] = len; // input block size
if (ioctl(fd, BLKDISCARD, &range)
{

}
}

close(fd)

Best Regards,
Manoj

Re: programming interface to eMMC

Bio_TICFSL — Fri, 30 Sep 2022 11:47:13 GMT

Hello,

You need to go with QNX for support on its OS, but you need erase and burn the eMMC every time you program code.

Regards

Re: programming interface to eMMC

manojp — Sun, 02 Oct 2022 08:52:23 GMT

thanks, I got help from QNX for same.

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programming interface to eMMC

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